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<p>The growing demand for high-performance copper alloys in critical applications has directed research focus toward the Cu–Fe–Co system. This study systematically investigates the influence and mechanisms of Al microalloying on the microstructure and properties of this alloy. By adding trace amounts of Al to the CuFeCo alloy, the regulatory effects of Al on the microstructure, mechanical properties, and electrical conductivity were examined. The results indicate that the added Al atoms dissolve uniformly into the copper matrix. This effectively promotes a morphological transition of the iron dendrites from a sharp, branched structure to a more ellipsoidal one and significantly increases the dislocation density. These microstructural changes lead to a notable improvement in microhardness, yield strength, and ultimate tensile strength. The optimal combination of mechanical properties (yield strength of 448.5&#xa0;MPa, ultimate tensile strength of 482.3&#xa0;MPa, and elongation of 15.7%) was achieved at an Al content of 0.2 wt.%. Furthermore, the addition of Al increases the concentration of solute atoms in the matrix, enhancing electron scattering and consequently resulting in a decrease in the electrical conductivity of the alloy. This research provides an experimental basis for the design of high-performance Cu-Fe-based alloys via Al microalloying.</p>

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Effect of Al on Microstructure and Properties of CuFeCo Alloy during Thermomechanical Treatment

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Yan Liao,
  • Meilong Feng,
  • Xiujuan Zhang,
  • Cuicui Ge,
  • Fuguan Peng,
  • Pengfei Zhang

摘要

The growing demand for high-performance copper alloys in critical applications has directed research focus toward the Cu–Fe–Co system. This study systematically investigates the influence and mechanisms of Al microalloying on the microstructure and properties of this alloy. By adding trace amounts of Al to the CuFeCo alloy, the regulatory effects of Al on the microstructure, mechanical properties, and electrical conductivity were examined. The results indicate that the added Al atoms dissolve uniformly into the copper matrix. This effectively promotes a morphological transition of the iron dendrites from a sharp, branched structure to a more ellipsoidal one and significantly increases the dislocation density. These microstructural changes lead to a notable improvement in microhardness, yield strength, and ultimate tensile strength. The optimal combination of mechanical properties (yield strength of 448.5 MPa, ultimate tensile strength of 482.3 MPa, and elongation of 15.7%) was achieved at an Al content of 0.2 wt.%. Furthermore, the addition of Al increases the concentration of solute atoms in the matrix, enhancing electron scattering and consequently resulting in a decrease in the electrical conductivity of the alloy. This research provides an experimental basis for the design of high-performance Cu-Fe-based alloys via Al microalloying.